PRESSURE CONTROL VALVE MECHANISM OF HYDRAULIC CLUTCH

摘要

PURPOSE:To prevent assembling error by using the same springs in the bypass valve and the low pass valve of a pressure control valve mechanism and setting the spool diameter of the bypass valve smaller than that of the low pass valve. CONSTITUTION:A bypass valve 19 opening against energizing force of a spring 19A with the pressure work of a secondary side pilot communicating to a hydraulic clutch C, a low pass valve 20 closing against energizing force of a spring 20A with the pressure work of the secondary side pilot and an orifice 21 are incorporated in a valve body in the condition of parallel connection and set in a pressure control valve mechanism 16 as an unit. And the spring of the same dimension are used in the spring 19A and the spring 20A. But a diameter of a spool 19B for the bypass valve 19 is made smaller than that of a spool 20B for the low pass valve 20 so that the pilot pressure exerted on the bypass valve 19 becomes higher than that exerted on the low pass valve 20.